Drop-brake-staff mechanism



2 ySheets-Sheet 1 w. w. LINDBLOM DROP BRAKE STAFF MECHANISM Filed Au,;.10. 1926 T1 y afp.; ///1 a z m OO @zi @o6 Y r 9 @m00 .00 ff IMI @A w ,af W/// @o 00E/6 4/ Feb. y15, 1927-.

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' w. w. I munBLcaM'4r DROP BRAKEl STAFF MECHANISM Filed Aug. 1o, 1926 l2 Sheets-sheet 2 j. ),/m/ E iw 5 lli Patented Feb. l5, 1927. i

WILLIAM w. L I'Nipsron, or met: rreuurarinimcrrrsan;

i mwF-BaAKE-sma Meenemen;

`- Y Applilcationled August 10, 1926. Seriai No'f'lfi.Vy

a brake stali' This invention relates to and'has for en -e mechanism for railway cars,

Y of its objects to provide a mechanismv of this the character including a drum to which brake chain is secured, a staif to which the hand wheel issecured and which is slidably associated f with thel drum to permit it to be ad]usted into a raised or lowered position with respect to -the drum, and novel means 1U for suppcrting the steif in its raised position against any possibility of its cas-ual movement fromsuch'position.

r1`he invention is hereinafter more ,fully described and claimed, and is illustrated in l5 theaccompanying drawings wherein: .i f Figure 1 is an elevational view of a brake staff ymechanism constructed in accordance with iny invention, the brake staff being shown in raised position,

i staff in lowered position, Flgue Sis a sectional Figure 2,

Figure staff, 4 v

Figure 6 is a detail sectional view Iof the drum, and Y n Figure 7 is a` sectional view taken on the horizontal planeindicated by the linel 6-6 of Figure 3.

l Corresponding and like vparts are referred 'to in the following description, and designated in the several views ofthe accompanying drawings, by similar reference characters. A

The mechanism comprises a drum 2 and a .staff 3 which are telescopically associated. The drum 2 is shown rotatably supported on an end sill 4 of a railway car by the usual brake staff step 5 and bearing bracket 6. The uppervend of theA drum 2 is diametrically enlarged and provided with ratchet teeth 7. A pawl 8 pivoted a as atr9 upon the bearing bracket 6, cooperates with the ratchet teeth 7 tot hold the drum 2 against casual movement in unwinding direction. The drum apertured lug 10 to which abrake chain 11 is secured. A hand Y the upper end of L.the stad 3, and the upper 55 end of a bore 13 of the drum 2 is provide with a conical recess 14: for the reception 5'is a view in elevation 'of the Figure v2 is asimilar view with the brake Figure4 4 is asimilar view takenv on theA verticalVv plane indicated by the line 41-4 of until? itslugsy 2 2 `are in alinement with the i 2 is provided with anwheel 12 is secured to t v.ment with the grooves 16, then l d the lugs are in alinement with the grooves the staff .3 is lowered position. Y

Below the recess 141, the borelfi's of 1 polygon l formation in Vcross. section,` and is provided with" vertical grooves 15which communicate at'th'eir upper ends by way of. horizontal grooves 16, with the upperv ends of opposed grooves 17. The' lgrooves y15.y open out throvugh'the lower end of the bore 13, thegrooves 16' extendiir opposite direc-Vv tions from the upper ends of the"v grooves 15 and the grooves 17 terminateshort'ofsaid end` of the bore and their lower endsconstitute shoulders 18. To permit the grooves 15, 16-and117 to be readily formed, the drum 2 may be made in sections and the sections thereof may beV connected together as shown at 19.

The staff s ofthehub 12@- ofthe handfwheel 12`when`l is lof polygonal formation in cross section forthe major portion of'its length, as shown at A2() and is provided with a cylindrical lower end-21. It may be adjusted intoaraised or lowered position with respect to the'druin, as shownin Figures 1 and 2, respectively, and is supported inraised position with respect to the drum `2 by means of lugs 22fprojecting in opposite directions from its cylindrical end 21 intov the grooves 17 and resting upon fthe shouldrs'18, When the lugs -22 are resting upon the shoulders 18 the lower end of thei'polygonal portion 2O of the staff 8 is positioned in the upper end ofthe polygonal portion of 4.the b'o'rel13, and due 'thereto a driving connection is` established. between the staff v and drum 2. Vhen it is desired to adjust the staff l3 into its lowered position with respect to the drum 2, the staff istirst raised grooves 16, 4then turned until the kvlugs', are inalinement with the 'grooves -15 and then moved downwardly. lvVheny the lugs 22 are i in contact with theV upper endwalls ofthe grooves 17 they are `in alinement withthe grooves16, and when they are incontactr with the remote end walls of the grooves 16 they are in alinement with the grooves 15, and in view thereof thev staff 3 may be easily and quickly adjusted into its lowered position with lrespect to thedrum 2. When it is desired to adjust vvthe staff 3 into its raised position with respect to the drum 2,

it is first raiseduntilthe lugs 22 are in aline- 4 turned until l11o 17, and thence lowered Vuntil the lugs rest upon the shoulders 18. When the lugs 22 are in contact with the upper end walls of the grooves 15 they are in alinement with the grooves 16, and when in contact with the remote end walls of the grooves 16 they are in alinementwith the grooves 17, and due thereto the staff 3 may be easily and vquickly V.adjusted into its raised positionjvith respect to the'drum and secured 1n interlocking connection 'with respect to the drum. As the staff 3 must, before vit can beY adjusted into its lowered position withv respect to the drum 2, be first raised until' the' lugs 22 are in alinement with the grooves 16 and then turned until the lugs are in alinement with the grooves 15, there is no possibility of ,the casualmovement of the staff into lowered position. When the lugs 22 are in alinement with the grooves 16, the cylindrical portion 21 of the staff 3, and no part of its polygonal portion 20, is located in the polygonal portion of the bore 13, and duethereto the staff may be turned to position theY lugs in alinement with the grooves 15 or 17 depending upon whether it is wished to adjust the stalf into its lowered or raised position with respect tothe drum 2. The staff 3 may be inserted in theV drum 2 through the lower end of the latter, and after it has been passed through the drum the hand wheel 12 is secured to its upper end. l

It should berunderstood that the drawings are merely illustrative and do not pretend to give exact proportions. Furthermore, the

said drawings are illustrative of a preferred construction, it being my expectation that various changes and modifications may be made without depart-ing from the spirit and scope of my invention. "What is claimed is 1. A brake staff mechanism comprising a drum provided with a polygonal bore, said drum being provided between its ends with an interior shoulderfand having an interior groove extending from one end thereof to the shoulder, a staff having polygonal and cylindrical portions and telescoplcally associated with the drum for adjustment into aV K l raised or lowered position with respect thereto, and a lug carried by the cylindrical portion of the stafln and fitting in said groove and adapted to rest upon the shoulder to support the staff in raised position.

2. A brake statt1 mechanism, comprising a drum provided with a polygonal bore and provided in thev wall of said bore with a shoulder and a. groove extending upwardly and downwardly from said shoulder, a staff telescopically associated with the drum for adjustment into a raised or lowered position with respect thereto and having polygonal and cylindrical portions, and a lug carried by the cylindrical portion of the staff and fitting in said groove and adapted 'to rest upon the shoulder to support the staff in raised position. Y

A brake staff mechanism comprising a drum having a polygonal bore having an enlarged upper end, the wall of the lower portion of' the bore being formed to providev a shoulder and a groove'extending upwardly and downwardly from the shoulder, a stai telescopically associated with the drum. for

adjustment into a raised or lowered position with respect thereto `and u having polygonal and cyhndrlcal portions, a lugcarried by the cylindrical portion of the staiv and a shoulder, a stai? telescopically associated with the drum for adjustment into a raised or lowered position with respectthereto and provided with polygonal and cylindrical portions, and. a lug carried by ther cylindrical portion and' fitting in said groove and adapted torest upon said shoulderv to Vsup-k port the stati' in Vraised position..

In testimony whereof I am); my signature.

WILLIAM w. LiNDBLoMf stati mechanism comprising a enlarged portion of 

